The carbon tax is due to come into effect on July 1 and will operate at a fixed price for three years before moving to a fluctuating trading price in 2015.

However there will be a floor on how low the price can go.

Mr Oakeshott was part of the committee that developed the scheme.

But he wants the floor price scrapped and says he is prepared to consider moving a disallowance motion in Parliament to overturn it.

"It is certainly one of the options, as is reconvening of the multi-party climate change committee and trying to renegotiate some of the aspects," he said.

Mr Oakeshott says the floor price could hurt businesses because it may be well above the international carbon price.

"Anyone who follows the international carbon price can see that the floor price in 2015 has the real potential of being in play - that is a risk to investment in Australia and a risk to the taxpayer in Australia," he said.

Anyone who follows the international carbon price can see that the floor price in 2015 has the real potential of being in play - that is a risk to investment in Australia and a risk to the taxpayer in Australia.

Independent MP Rob Oakeshott

"Hopefully, in a sensible way, policy makers - either through the multi-party Climate Change Committee or through other means - can really think hard about whether it is in the scheme's best interests ... and the nation's best interests."

Climate Change Minister Greg Combet says he will have discussions with the Mr Oakeshott about his concerns.

He says Mr Oakeshott signed an agreement to introduce the measure and the Government intends to abide by it.

But he says the Government has not yet regulated for the floor price and has refused to speculate about possible changes.

"We all negotiated that agreement, we intend abiding by it, but we haven't bought regulations forward at this stage to implement the floor price and I'll be having some discussions with Mr Oakeshott and others as we develop them," he said.

Prime Minister Julia Gillard says the Government is still considering how the floor price will work.

"The floor price question is about the emissions trading scheme period, so it's three years in the future," she said.

"We are consulting on how to do the floor price and there's certainly no rush in that process."

But the Greens say Mr Oakeshott's comments could undermine business certainty in the carbon pricing scheme.

Greens leader Christine Milne says the multi-party Climate Change Committee agreed to have a floor price and Mr Oakeshott should stick to that commitment.